#include <iostream>
using namespace std;
#define ADD(x,y) ((x)+(y))
#define CMP(x,y) ((x)>(y))

int main()
{
    double a,b,c;
    while(cin >> a >> b >> c)
    {
        if(a+b>c && a+c>b && b+c>a)
            cout << "Yes" << endl;
        else
            cout << "No" << endl;
    }
    return 0;
}
